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. 1976 Aug;58(2):163–168. doi: 10.1104/pp.58.2.163

Ethylene Formation in Sugar Beet Leaves

Evidence for the Involvement of 3-Hydroxytyramine and Phenoloxidase after Wounding 1

Erich F Elstner a, Jörg R Konze a, Bruce R Selman a, Claus Stoffer a
PMCID: PMC542204  PMID: 16659639

Abstract

Ethylene production by sugar beet (Beta vulgaris L.) leaf discs is inhibited by white (or red, >610 nm) light or by wounding. In contrast, in wounded leaf discs, ethylene production is stimulated by light. The effect of light on wounded leaf discs has been studied by using an in vitro system which mimics the loss of compartmentation in the wounded leaf. Chlorophyll-free extracts from sugar beet leaves stimulate the production of the superoxide free radical ion (as a prerequisite for ethylene formation) by illuminated chloroplast lamellae. The substance from the crude leaf extracts which is active in stimulating the production of the superoxide free radical ion has been identified as 3-hydroxytyramine (dopamine). Exogenous dopamine between 5 μm and 100 μm stimulates ethylene formation by illuminated chloroplast lamellae from methional. It also stimulates the production of the superoxide free radical ion, the formation of which apparently involves both a lamellar phenoloxidase and photosynthetic electron transport as a 1-electron donor, and is cyanide-sensitive.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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